20155

Appears in sequences

• Numbers k such that k and k+1 have the same sum of unitary divisors (A034448).at n=32A064125
• Numbers n such that sigma(n-1) + sigma(n+1) = sigma(2n).at n=5A067730
• Solve 2^n - 2 = 7(x^2 - x) + (y^2 - y) for (x,y) with x>0, y>0; a(n) = value of y.at n=28A076631
• a(n) = (6*n+1)*(6*n+7).at n=23A085026
• Column 10 of array illustrated in A089574 and related to A034261.at n=4A108538
• Column 11 of table A105552.at n=9A110554
• Expansion of (eta(q)^3*eta(q^10)^6)/(eta(q^2)^2*eta(q^5)^7) in powers of q.at n=44A113977
• a(n) = numerator of constant lambda(n) involved in a recurrence for the Atkin polynomials A_k(j).at n=23A145226
• Numbers k such that antisigma(k) mod k = antisigma(k+1) mod (k+1).at n=8A229114
• Number of partitions p of n such that 3*min(p) + (number of parts of p) is not a part of p.at n=36A238543
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 26880.at n=30A266397
• Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999).at n=23A293183
• Numbers k such that iphi(k) = iphi(k+1), where iphi is the infinitary totient function (A064380).at n=10A301866
• Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417).at n=25A306985
• Numbers k such that A113184(k) = A113184(k+1).at n=17A348585
• Numbers k such that k and k+1 have an equal sum of modified exponential divisors: A241405(k) = A241405(k+1).at n=24A379032